APPENDIX AVI212 Especificações descarregar pdf (Página 33)

Gaia

GAIA.ASU.SP.ESM.00007

Issue 2.00

Page 33 of 79

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GAIA.ASU.SP.ESM.00007 (Avionics SCOE Req Iss 2).doc

3.6.4.2 PacketWire Active Interface

To allow the Avionics SCOE to SPY the PacketWire BUS interfaces when the real CDMU and PDHU are

connected, an active interface is needed to allow the Avionics SCOE to monitor the PacketWire traffic

without disturbing normal BUS operation.

AVI-4129/CREATED/T

An Active Interface Box shall be provided for each PacketWire BUS to allow monitoring of the BUS

when the CDMU and PDHU units are connected.

Each Active Interface Box is connected between the Gaia CDMU and the PDHU, as shown in Figure 3.6-2.

PacketWire

Active Interface

PDHUCDMU

Avionics

SCOE

PacketWire

Interface

Test Harness

(Astrium Supplied)

Spacecraft

Harness

SCOE Cable

(Supplied with SCOE)

Interface Box

(Supplied with SCOE)

Figure 3.6-2: PacketWire Active Interface Box

AVI-4131/CREATED/T

The design of the Active Interface Box shall be such that SPY of both the prime and redundant side of

each PacketWire BUS is possible in parallel.

AVI-4132/CREATED/T

The design of the Active Interface Box shall be such that the PacketWire interface requirements, as

defined in [AD08] shall be maintained.

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